x1,y1,x2,y2 = [float(s) for s in input().split(' ')]

print(((x1-x2)**2 + (y1-y2)**2)**0.5) float(s) for s in input().split(' ') for s in input().split(' ') s input().split(' ') ().split () input split ' ' for s in input().split(' ') float(s) float s x1,y1,x2,y2 = [float(s) for s in input().split(' ')] x1 [float(s) for s in input().split(' ')] y1 x2 y2 print(((x1-x2)**2 + (y1-y2)**2)**0.5) print ((x1-x2)**2 + (y1-y2)**2)**0.5 (x1-x2)**2 + (y1-y2)**2 (x1-x2)**2 x1-x2 x1 x2 2 (y1-y2)**2 y1-y2 y1 y2 2 0.5 x2,y2 = [float(s) for s in input().split(' ')] [float(s) for s in input().split(' ')] x2 y1,x2,y2 = [float(s) for s in input().split(' ')] [float(s) for s in input().split(' ')] y1 x1,y1,x2,y2 = [float(s) for s in input().split(' ')] [float(s) for s in input().split(' ')] x1 y2 = [float(s) for s in input().split(' ')] [float(s) for s in input().split(' ')] y2
x1,y1,x2,y2 = [float(s) for s in input().split(' ')]

print(((x1-x2)**2 + (y1-y2)**2)**0.5)